Alloy



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JOSEPH C. STONE, OF BELMONT, MASSACHUSETTS.

ALLOY.

No Drawing.

T0 on whom it may concern:

Be itknown that I, JOSEP C. STONE, a citizen of the United States, residing at Belmont, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in an Alloy, of which the following is a specification.

This invention relates to alloys from which metal parts may be made that are to be subjected to the act-ion of acids, or are to be used where they are likely to come in contact With materials or solutions that would corrode metals of the usual kinds. The invention is concerned particularly with the provision of an alloy from which the pipe fittings and metal parts that hold or Where pipe fittings and conduct milk in dairies can be made. It is very important that milk shall not be contaminated by its contact with the pipe fittings or containers, and consequently it is essential that the acids of the milk shall not attack these metal parts. Similar problems also exist in numerous other industries, as for instance, in the paper and pulp industry, valves are subjected to the action of solutions containing a substantial percentage of sulphuric acid.

I have discovered that a very superior alloy can be made of copper, nickel, lead and tin in substantially the following proportions:-For castings, such for instance, as

pipe fittings for dairies, I prefer a composition consisting of approximately 73 copper 171; -nickel tin' 6 lead For sheets, or parts that are to be rolled, i prefer to vary the formula slightly and to use about 76%-"; copper 2O i nicke-l ,t1n 15% lead For valves andiother parts that are to be used in the handling of the sulphuric acid Application filed April 4,

like. It effectually 1922. Serial No. 549,570.

solutions dealt with in pulp and paper mak- It will be understood, of course, that the percentages of the constituents may be varied Within reasonable limits. I prefer to use materials that are as pure as possible and that are particularly free from aluminum, zinc, or iron, although a trace of any one of these ingredients is, for most purposes, not a serious factor. l

The alloy is made by melting the constituents together in the usual manner, preferably With the aid of a flux, such as zinc or carbon free manganese. The percentage of such a flux used can be very small, say about 1%, so that it will be completely oxidized during the compounding prbcess, and the product, therefore, Will not contain any, or at most only a trace, of the material used as a flux.

An alloy of the composition above dcscribed has proved very satisfactory indeed for the particular. purposes above mentioned. It has been used with especial satisfaction in dairies, pulp and .paper mills, for the metal parts of soda fountains, coffee urns, and the resists the action of acids, such as those found in milk, pulp liquor, and the like, it machines readily, and presents a pleasing appearance when properly finished. In addition this alloy finds many important uses in the jewelry trade, in marine Work, and in locations where the metal parts are exposed to the Weather or to the action of corrosive agents. The alloy in sheet form has considerable resiliency and is a valuable material from which to make springs that must be subjected to the action of corrosive agents.

Having thus described my invention, What I desireto claim as new 1. An alloy of thecharacter described con-.

sisting essentially of the following constitconsisting essentially of the following con 10 uents -in substantially the proportions st-ituents in approximately the proportionys named: named Copper 7O to76% Copperun 73 Nickel -4 17 t020% Nickel 17--% 1 Lead 1 -m 6% 'Tin'fi Tin 2:}to 5% Lead 6 2. An alloy of the character described JOSEPH C. STONE. 

